BBC: A new model of the Earth’s climate suggests that human-made carbon dioxide emissions may prevent the onset of the next ice age. Based on geological history, the Earth would be expected to enter a new ice age in 10,000 to 100,000 years. Researchers say even small changes in carbon dioxide levels right now could prevent this from happening. They tell the journal Nature this may not be good news as the planet could change in ways that are unprecedented. Man made …